Calumet Union Drainage Canal at Markham, IL
River level and flood forecast · Cook County
Normal2.4 ftas of Mon 2:45 PM
The river is 7.6 ft below flood stage (10 ft).
Flow: 3 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 6 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 11.5 ft |
| Moderate flood stage | 10.5 ft |
| Flood stage | 10 ft |
| Action stage | 9 ft |
| Record crest (October 11, 1954) | 12 ft |
What floods at each level
From the National Weather Service, highest first.
- 12.5 ftWidespread inundation of roadways and structures in the floodplain reaches 2 blocks from the canal in Markham and Harvey.
- 11 ftMultiple structures are threatened in Markham and Harvey.
- 10 ftMultiple roadways are threatened in Markham and Harvey. Low-lying sections of Martin Luther King Park are inundated in Markham.
- 9 ftWater overflows low-lying river banks along the canal in Markham and Harvey.
Highest crests on record
- 12 ft — October 11, 1954
- 11.5 ft — July 13, 1957
- 10 ft — September 14, 2008
- 8.64 ft — May 17, 2020
- 8.24 ft — July 19, 2020
Recent crests: 8.24 ft (July 19, 2020) · 8.64 ft (May 17, 2020) · 10 ft (September 14, 2008) · 11.5 ft (July 13, 1957) · 12 ft (October 11, 1954)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (MKHI2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.